pmdazswap is a Performance Metrics Domain Agent (PMDA) which exports
metric values about compressed swap operation, as tracked by the
zswap Linux kernel module.
Zswap is a lightweight compressed cache for swap pages. It takes
pages that are in the process of being swapped out and attempts to
compress them into a dynamically allocated RAM-based memory pool.
Zswap trades CPU cycles for potentially reduced swap I/O. This
tradeoff can also result in a performance improvement if reads from
the compressed cache are faster than reads from a swap device.
This PMDA exports metrics about pool size, number of pages stored,
and various counters for the reasons pages are rejected.
Install the zswap PMDA by using the Install script as root:
# cd $PCP_PMDAS_DIR/zswap# ./Install
To uninstall, do the following as root:
# cd $PCP_PMDAS_DIR/zswap# ./Removepmdazswap is launched by pmcd(1) and should never be executed
directly. The Install and Remove scripts notify pmcd(1) when the
agent is installed or removed.
installation script for the pmdazswap agent
undo installation script for the pmdazswap agent
default log file for error messages from pmdazswap
Environment variables with the prefix PCP_ are used to parameterize
the file and directory names used by PCP. On each installation, the
file /etc/pcp.conf contains the local values for these variables.
The $PCP_CONF variable may be used to specify an alternative
configuration file, as described in pcp.conf(5).
This page is part of the PCP (Performance Co-Pilot) project.
Information about the project can be found at ⟨http://www.pcp.io/⟩.
If you have a bug report for this manual page, send it to
email@example.com. This page was obtained from the project's upstream
Git repository ⟨https://github.com/performancecopilot/pcp.git⟩ on
2020-07-14. (At that time, the date of the most recent commit that
was found in the repository was 2020-07-14.) If you discover any
rendering problems in this HTML version of the page, or you believe
there is a better or more up-to-date source for the page, or you have
corrections or improvements to the information in this COLOPHON
(which is not part of the original manual page), send a mail to
Performance Co-Pilot PCP PMDAZSWAP(1)